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context_test.go
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context_test.go
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// Copyright 2019 Roger Chapman and the v8go contributors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package v8go_test
import (
"encoding/json"
"fmt"
"testing"
v8 "rogchap.com/v8go"
)
func TestContextExec(t *testing.T) {
t.Parallel()
ctx := v8.NewContext(nil)
defer ctx.Isolate().Dispose()
defer ctx.Close()
ctx.RunScript(`const add = (a, b) => a + b`, "add.js")
val, _ := ctx.RunScript(`add(3, 4)`, "main.js")
rtn := val.String()
if rtn != "7" {
t.Errorf("script returned an unexpected value: expected %q, got %q", "7", rtn)
}
_, err := ctx.RunScript(`add`, "func.js")
if err != nil {
t.Errorf("error not expected: %v", err)
}
iso := ctx.Isolate()
ctx2 := v8.NewContext(iso)
defer ctx2.Close()
_, err = ctx2.RunScript(`add`, "ctx2.js")
if err == nil {
t.Error("error expected but was <nil>")
}
}
func TestJSExceptions(t *testing.T) {
t.Parallel()
tests := [...]struct {
name string
source string
origin string
err string
}{
{"SyntaxError", "bad js syntax", "syntax.js", "SyntaxError: Unexpected identifier 'js'"},
{"ReferenceError", "add()", "add.js", "ReferenceError: add is not defined"},
}
ctx := v8.NewContext(nil)
defer ctx.Isolate().Dispose()
defer ctx.Close()
for _, tt := range tests {
tt := tt
t.Run(tt.name, func(t *testing.T) {
_, err := ctx.RunScript(tt.source, tt.origin)
if err == nil {
t.Error("error expected but got <nil>")
return
}
if err.Error() != tt.err {
t.Errorf("expected %q, got %q", tt.err, err.Error())
}
})
}
}
func TestContextRegistry(t *testing.T) {
t.Parallel()
ctx := v8.NewContext()
defer ctx.Isolate().Dispose()
defer ctx.Close()
ctxref := ctx.Ref()
c1 := v8.GetContext(ctxref)
if c1 == nil {
t.Error("expected context, but got <nil>")
}
if c1 != ctx {
t.Errorf("contexts should match %p != %p", c1, ctx)
}
ctx.Close()
c2 := v8.GetContext(ctxref)
if c2 != nil {
t.Error("expected context to be <nil> after close")
}
}
func TestMemoryLeak(t *testing.T) {
t.Parallel()
iso := v8.NewIsolate()
defer iso.Dispose()
for i := 0; i < 6000; i++ {
ctx := v8.NewContext(iso)
_ = ctx.Global()
// _ = obj.String()
_, _ = ctx.RunScript("2", "")
ctx.Close()
}
if n := iso.GetHeapStatistics().NumberOfNativeContexts; n >= 6000 {
t.Errorf("Context not being GC'd, got %d native contexts", n)
}
}
// https://github.com/rogchap/v8go/issues/186
func TestRegistryFromJSON(t *testing.T) {
t.Parallel()
iso := v8.NewIsolate()
defer iso.Dispose()
global := v8.NewObjectTemplate(iso)
err := global.Set("location", v8.NewFunctionTemplate(iso, func(info *v8.FunctionCallbackInfo) *v8.Value {
v, err := v8.NewValue(iso, "world")
fatalIf(t, err)
return v
}))
fatalIf(t, err)
ctx := v8.NewContext(iso, global)
defer ctx.Close()
v, err := ctx.RunScript(`
new Proxy({
"hello": "unknown"
}, {
get: function () {
return location()
},
})
`, "main.js")
fatalIf(t, err)
s, err := v8.JSONStringify(ctx, v)
fatalIf(t, err)
expected := `{"hello":"world"}`
if s != expected {
t.Fatalf("expected %q, got %q", expected, s)
}
}
func BenchmarkContext(b *testing.B) {
b.ReportAllocs()
iso := v8.NewIsolate()
defer iso.Dispose()
for n := 0; n < b.N; n++ {
ctx := v8.NewContext(iso)
ctx.RunScript(script, "main.js")
str, _ := json.Marshal(makeObject())
cmd := fmt.Sprintf("process(%s)", str)
ctx.RunScript(cmd, "cmd.js")
ctx.Close()
}
}
func ExampleContext() {
ctx := v8.NewContext()
defer ctx.Isolate().Dispose()
defer ctx.Close()
ctx.RunScript("const add = (a, b) => a + b", "math.js")
ctx.RunScript("const result = add(3, 4)", "main.js")
val, _ := ctx.RunScript("result", "value.js")
fmt.Println(val)
// Output:
// 7
}
func ExampleContext_isolate() {
iso := v8.NewIsolate()
defer iso.Dispose()
ctx1 := v8.NewContext(iso)
defer ctx1.Close()
ctx1.RunScript("const foo = 'bar'", "context_one.js")
val, _ := ctx1.RunScript("foo", "foo.js")
fmt.Println(val)
ctx2 := v8.NewContext(iso)
defer ctx2.Close()
_, err := ctx2.RunScript("foo", "context_two.js")
fmt.Println(err)
// Output:
// bar
// ReferenceError: foo is not defined
}
func ExampleContext_globalTemplate() {
iso := v8.NewIsolate()
defer iso.Dispose()
obj := v8.NewObjectTemplate(iso)
obj.Set("version", "v1.0.0")
ctx := v8.NewContext(iso, obj)
defer ctx.Close()
val, _ := ctx.RunScript("version", "main.js")
fmt.Println(val)
// Output:
// v1.0.0
}